EP0169048A2 - Ultra-high frequency switch - Google Patents
Ultra-high frequency switch Download PDFInfo
- Publication number
- EP0169048A2 EP0169048A2 EP85305047A EP85305047A EP0169048A2 EP 0169048 A2 EP0169048 A2 EP 0169048A2 EP 85305047 A EP85305047 A EP 85305047A EP 85305047 A EP85305047 A EP 85305047A EP 0169048 A2 EP0169048 A2 EP 0169048A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- ultrahigh frequency
- switch
- terminals
- frequency switch
- impedance conversion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/10—Auxiliary devices for switching or interrupting
- H01P1/12—Auxiliary devices for switching or interrupting by mechanical chopper
- H01P1/122—Waveguide switches
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
- H01P5/10—Coupling devices of the waveguide type for linking dissimilar lines or devices for coupling balanced with unbalanced lines or devices
- H01P5/107—Hollow-waveguide/strip-line transitions
Definitions
- the present invention relates to an ultrahigh frequency switch which is applicable up to a high frequency range above 18 GHz and provided with mechanical contacts.
- Switching circuits which are operable with frequencies higher than 18 GHz (hereinafter referred to as quasimillimeter waves) may generally be classified into four types, i. e. , a waveguide switch type, a coaxial switch type, a diode switch type, and a ferrite switch type.
- the waveguide switch type circuit is produced by boring a part of a waveguide and mounting a rotor in the bore, the rotor being rotatable to switch the waveguide paths.
- This type of circuit shows significantly low insertion losses and remarkable cut-off attenuation between non-connect ports and, thereby, represents a minimum of ohmic loss on the inner surface of the waveguide to withstand passage of larger power.
- the applicable range of such a switching circuit is quite limited due to the intricate construction, large amount of switching energy, and long switching time.
- the coaxial switch type circuit includes movable center conductors in a strip line configuration which are caused into opening and closing actions toward and away from stationary contacts connected to coaxial connectors. While this type of switching circuit has a. simple construction, ensures substantial cut-off attenuation, and shortens the switching time, the insertion loss undesirably increases at frequencies higher than several GHz to thereby degrade the matching condition.
- the diode switch type circuit is an effective solution to the switching time problem. Nevertheless, it is unsatisfactory from the characteristics standpoint because, for example, the insertion loss is relatively high and the cut-off attenuation available therewith is not so great.
- the ferrite switch type circuit is constructed to reverse the flux direction biased on a ferrite member which is inserted in the circuit.
- the problem with this switching circuit is that for the flux reversal it consumes substantial energy and, in addition, the insertion loss and matching condition become poor in the ultrahigh frequency range.
- the disclosed miniature switch is capable of implementing various kinds of switch configuration such as a double-pole double-throw switch in a simple structure.
- the miniature switch allows the voltage standing wave ratio (VSWR) and insertion loss to increase with the circuit frequency.
- An ultrahigh frequency switch for switching a signal which lies in an ultrahigh frequency range of the present invention comprises a plurality of terminals to which the ultrahigh frequency signal is applied, intermediating members made of movable conductors for establishing and interrupting interconnection between the terminals, each of the intermediating members constituting an elongate and flat center conductor in a strip line configuration which has a low circuit characteristic impedance, and an impedance matching member for matching the strip line and the waveguide terminals.
- an ultrahigh frequency switch features a desirable frequency characteristic, significantly short switching time, and small-size construction.
- Impedance transformer members are connected between a waveguide serving as input and output terminals and an opening and closing switch section. Elongate and flat movable center conductors in a strip-line configuration are driven from the outside to in turn open and close the impedance transformer members, thereby opening and closing the circuit.
- ultrahigh frequency switch of the present invention is susceptible of numerous physical embodiments, depending upon the environment and requirements of use, substantial numbers of the herein shown and described embodiments have been made, tested and used, and all have performed in an eminently satisfactory manner.
- the switch 10 includes a housing 12 in which a movable center conductor 14 having a flat and elongate configuration is disposed.
- a drive rod 16 is mounted on the center conductor 14.
- a solenoid 18 has a coil 20 and a plunger 22 which is movable up and down responsive to energization or deenergization of the coil 20 to in turn actuate the center conductor 14 and drive rod 16.
- the plunger 22 when the coil 20 is energized, the plunger 22 is moved downwardly against the action of a return spring 24 to in turn press the drive rod 16 downwardly overcoming the action of a coil spring 26. Then, the center conductor 14 which is integral with the drive rod 16 makes electrical contact with contact surfaces 18a and 30a of impedance conversion members, or input terminals, 28 and 30 at the underside of its opposite ends. As the coil 20 is deenegized, the plunger 22 is urged upwardly by the action of the return spring 24 and, so, the center electrode 14 by the coil spring 26. As a result, the upper surface of the center conductor 14 is brought into contact with the underside of the housing 12, as shown in Fig. 4. Although not shown in the drawing, this part of the housing 12 is maintained at the same potential as an external conductor of the waveguide and, hence, a substantial amount of attenuation develops between the center conductor 14 which is engaged with that housing portion and the waveguide circuit.
- the impedance conversion members 28 and 30 are designed such that their impedance becomes lowest at the inntermost contact surfaces -28a and 30a.
- each of the impedance conversion members 28 and 30 is provided in a multi-ridge configuration; the housing 12 is provided with a cavity 34 in the vicinity of the contact surfaces 28a and 30a to thereby definine a sufficient distance for insulation.
- the characteristic impedance associated with the contact surfaces 28a and 30a is matched with that associated with the center conductor 14, which is a strip line, a low VSWR will be accomplished over a wide band.
- the center conductor 14 which is a strip line
- a low VSWR will be accomplished over a wide band.
- about 60-85 ohms of characteristic impedance will suffice practical applications.
- one of characteristic features of the present invention is that switching occurs in that portion of the waveguide path where the characteristic impedance is lower than the rest.
- guides 36 are adapted to guide the center conductor 14 such that the latter moves in a predetermined direction without shaking. This allows the distance of movement of the center conductor 14 to be designed long enough to set up a sufficient amount of attenuation.
- the waveguide path is normally open, and closed when the coil 20 of the solenoid 18 is energized.
- the impedance conversion members 28 and 30 may be positioned upside down as shown in Fig. 5.
- a switch generally 40, includes impedance conversion members, or input terminals, which are arranged not in a single-pole single-throw configuration but in a single-pole double-throw configuration.
- the switch 40 in this case is provided with two movable center conductors 42a and 42b.
- one end of the conductor 42a makes contact with a contact surface 44a of an input side impedance conversion member 44 and the other end with a contact surface 46a of an output side impedance conversion member 46
- one end of the conductor 42b makes contact with a contact surface 44a of an input side impedance conversion member 46 and the other end with an output side impedance conversion member 48.
- the contact surface 44a of the input side impedance conversion member 44 is provided with a larger area than the contact surface 28a of the impedance conversion member 28 of the first embodiment in order to accommodate the ends of the two center condutors 42a and 42b.
- a switch generally 50, includes impedance conversion members, or output terminals, which are arranged in a double-pole double-throw configuration.
- the switch 50 is provided with four movable center conductors 52a, 52b, 52c and 52d, input side impedance conversion members 54 and 56, and output side impedance conversion members 58 and 60.
- Opposite ends of the conductor 52a respectively are engageable with the contact surfaces 54a and 60a of the impedance conversion members 54 and 60, opposite ends of the conductor 52b with contact surfaces 54a and 56a of the impedance conversion members 54 and 56, opposite ends of the conductor 52c with contact surfaces 56a and 58a of the impedance conversion members 56 and 58, and opposite ends of the conductor 52d with contact surfaces 58a and 60a of the impedance conversion members 58 and 60.
- impedance conversion members in any of the foregoing embodiments have been provided with a stepped-ridge configuration, they may alternatively be provided with a linear tapered transformer type configuration as represented by an impedance conversion member 70 having a contact surface 70a shown in Fig. 8, or a special function type configuration as represented by an impedance conversion member 80 having a contact surface 80 shown in Fig. 9.
- the ridge type impedance conversion members may be replaced with conical impedance conversion members 90 and 92 as shown in Figs. 10 and 11.
- the conical members 90 and 92 are provided with contact surfaces 90a and 92a, respectively.
- the conical configuration slightly narrows the band width but is favorably applicable to a circuit in which importance is placed on a small-sized construction rather than characteristics.
- the present invention provides an ultrahigh frequency switch which shows a desirable frequency characteristic and low insertion loss and cuts down the switching time, even in a high frequency range above 18 GHz.
- the switch of the present invention is applicable to various kinds of input and output terminals, consumes a minimum of switching energy, achieves a compact configuration, and can be put to practical use at low costs.
Abstract
Description
- The present invention relates to an ultrahigh frequency switch which is applicable up to a high frequency range above 18 GHz and provided with mechanical contacts.
- Switching circuits which are operable with frequencies higher than 18 GHz (hereinafter referred to as quasimillimeter waves) may generally be classified into four types, i. e. , a waveguide switch type, a coaxial switch type, a diode switch type, and a ferrite switch type.
- The waveguide switch type circuit is produced by boring a part of a waveguide and mounting a rotor in the bore, the rotor being rotatable to switch the waveguide paths. This type of circuit shows significantly low insertion losses and remarkable cut-off attenuation between non-connect ports and, thereby, represents a minimum of ohmic loss on the inner surface of the waveguide to withstand passage of larger power. However, the applicable range of such a switching circuit is quite limited due to the intricate construction, large amount of switching energy, and long switching time.
- The coaxial switch type circuit includes movable center conductors in a strip line configuration which are caused into opening and closing actions toward and away from stationary contacts connected to coaxial connectors. While this type of switching circuit has a. simple construction, ensures substantial cut-off attenuation, and shortens the switching time, the insertion loss undesirably increases at frequencies higher than several GHz to thereby degrade the matching condition.
- The diode switch type circuit is an effective solution to the switching time problem. Nevertheless, it is unsatisfactory from the characteristics standpoint because, for example, the insertion loss is relatively high and the cut-off attenuation available therewith is not so great.
- Further, the ferrite switch type circuit is constructed to reverse the flux direction biased on a ferrite member which is inserted in the circuit. The problem with this switching circuit is that for the flux reversal it consumes substantial energy and, in addition, the insertion loss and matching condition become poor in the ultrahigh frequency range.
- With such merits and demerits of various types of switching circuits known in the art in mind, a very small switch for a waveguide which is equivalent in switching time to the previously mentioned coaxial switch type circuit and which has relatively small insertion loss even in the quasimillimeter band has been proposed as disclosed in Japanese Patent Application No. 51-146771. Using movable center conductors having a stripline configuration as switching elements, the disclosed miniature switch is capable of implementing various kinds of switch configuration such as a double-pole double-throw switch in a simple structure. However, due to the use of coaxial- waveguide transducers for a waveguide interface, the miniature switch allows the voltage standing wave ratio (VSWR) and insertion loss to increase with the circuit frequency.
- It is therefore an object of the present invention to provide an ultrahigh frequency switch which is free from degradation of characteristics even at frequencies higher than 18 GHz.
- It is another object of the present invention to provide a generally improved ultrahigh frequency switch.
- An ultrahigh frequency switch for switching a signal which lies in an ultrahigh frequency range of the present invention comprises a plurality of terminals to which the ultrahigh frequency signal is applied, intermediating members made of movable conductors for establishing and interrupting interconnection between the terminals, each of the intermediating members constituting an elongate and flat center conductor in a strip line configuration which has a low circuit characteristic impedance, and an impedance matching member for matching the strip line and the waveguide terminals.
- In accordance with the present invention, an ultrahigh frequency switch features a desirable frequency characteristic, significantly short switching time, and small-size construction. Impedance transformer members are connected between a waveguide serving as input and output terminals and an opening and closing switch section. Elongate and flat movable center conductors in a strip-line configuration are driven from the outside to in turn open and close the impedance transformer members, thereby opening and closing the circuit.
- The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description taken with the accompanying drawings.
-
- Fig. 1 is a vertical section of an ultrahigh frequency switch embodying the present invention;
- Fig. 2 is a section along line A-A of Fig. 1;
- Fig. 3 is a perspective view of a left half of the switch shown in Fig. 2;
- Fig. 4 shows in a vertical section the switch of Fig. 1 which i in an open position;
- Fig. 5 is a vertical section showing a construction which is applicable to a case wherein a solenoid coil is energized in the opposite relation to Fig. I ;
- Fig. 6 is a plan view of another embodiment of the present invention having input terminals arranged for single-pole double-throw switching;
- Fig. 7 is a plan view of another embodiment of the present invention having input terminals arranged for double-pole double-throw switching ;
- Fig. 8 is a fragmentary vertical section showing a linear impedance transformer arrangement;
- Fig. 9 is a fragmentary vertical section showing a special function impedance transformer arrangement;
- Fig. 10 is a plan view of a cone type impedance transformer arrangement; and
- Fig. 11 is a vertical section of the arrangement shown in Fig. 10.
- While the ultrahigh frequency switch of the present invention is susceptible of numerous physical embodiments, depending upon the environment and requirements of use, substantial numbers of the herein shown and described embodiments have been made, tested and used, and all have performed in an eminently satisfactory manner.
- Referring to Figs. 1-3, an ultrahigh frequency switch embodying the present invention is shown and generally designated by the
reference numeral 10. Theswitch 10 includes ahousing 12 in which amovable center conductor 14 having a flat and elongate configuration is disposed. Adrive rod 16 is mounted on thecenter conductor 14. Asolenoid 18 has acoil 20 and aplunger 22 which is movable up and down responsive to energization or deenergization of thecoil 20 to in turn actuate thecenter conductor 14 anddrive rod 16. - In this particular embodiment, when the
coil 20 is energized, theplunger 22 is moved downwardly against the action of areturn spring 24 to in turn press thedrive rod 16 downwardly overcoming the action of acoil spring 26. Then, thecenter conductor 14 which is integral with thedrive rod 16 makes electrical contact withcontact surfaces 18a and 30a of impedance conversion members, or input terminals, 28 and 30 at the underside of its opposite ends. As thecoil 20 is deenegized, theplunger 22 is urged upwardly by the action of thereturn spring 24 and, so, thecenter electrode 14 by thecoil spring 26. As a result, the upper surface of thecenter conductor 14 is brought into contact with the underside of thehousing 12, as shown in Fig. 4. Although not shown in the drawing, this part of thehousing 12 is maintained at the same potential as an external conductor of the waveguide and, hence, a substantial amount of attenuation develops between thecenter conductor 14 which is engaged with that housing portion and the waveguide circuit. - While the waveguide of the
switch 10 normally has a TE10 mode opening 32, theimpedance conversion members impedance conversion members housing 12 is provided with acavity 34 in the vicinity of thecontact surfaces contact surfaces center conductor 14, which is a strip line, a low VSWR will be accomplished over a wide band. However, about 60-85 ohms of characteristic impedance will suffice practical applications. As described above, one of characteristic features of the present invention is that switching occurs in that portion of the waveguide path where the characteristic impedance is lower than the rest. - In Fig. 3,
guides 36 are adapted to guide thecenter conductor 14 such that the latter moves in a predetermined direction without shaking. This allows the distance of movement of thecenter conductor 14 to be designed long enough to set up a sufficient amount of attenuation. - In this particular embodiment, the waveguide path is normally open, and closed when the
coil 20 of thesolenoid 18 is energized. In the case of a waveguide path which is normally closed and opened during transmission of an externally derived signal, theimpedance conversion members - Referring to Fig. 6, a second embodiment of the present invention is shown. A switch, generally 40, includes impedance conversion members, or input terminals, which are arranged not in a single-pole single-throw configuration but in a single-pole double-throw configuration. The
switch 40 in this case is provided with twomovable center conductors conductor 42a makes contact with acontact surface 44a of an input sideimpedance conversion member 44 and the other end with a contact surface 46a of an output sideimpedance conversion member 46, while one end of theconductor 42b makes contact with acontact surface 44a of an input sideimpedance conversion member 46 and the other end with an output sideimpedance conversion member 48. In this construction, thecontact surface 44a of the input sideimpedance conversion member 44 is provided with a larger area than thecontact surface 28a of theimpedance conversion member 28 of the first embodiment in order to accommodate the ends of the twocenter condutors - Referring to Fig. 7, still another embodiment of the present invention is shown. A switch, generally 50, includes impedance conversion members, or output terminals, which are arranged in a double-pole double-throw configuration. In this case, therefore, the
switch 50 is provided with fourmovable center conductors 52a, 52b, 52c and 52d, input sideimpedance conversion members impedance conversion members impedance conversion members impedance conversion members impedance conversion members conductor 52d with contact surfaces 58a and 60a of theimpedance conversion members - While the impedance conversion members in any of the foregoing embodiments have been provided with a stepped-ridge configuration, they may alternatively be provided with a linear tapered transformer type configuration as represented by an
impedance conversion member 70 having acontact surface 70a shown in Fig. 8, or a special function type configuration as represented by an impedance conversion member 80 having a contact surface 80 shown in Fig. 9. - Further, in order to reduce the overall dimensions of the switch, the ridge type impedance conversion members may be replaced with conical
impedance conversion members conical members - In summary, it will be seen that the present invention provides an ultrahigh frequency switch which shows a desirable frequency characteristic and low insertion loss and cuts down the switching time, even in a high frequency range above 18 GHz. The switch of the present invention is applicable to various kinds of input and output terminals, consumes a minimum of switching energy, achieves a compact configuration, and can be put to practical use at low costs.
- Varous modifiations will become possible for those skilled in the art after receiving the teachings of the present disclosure without departing from the scope thereof.
Claims (5)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP59150929A JPS61112401A (en) | 1984-07-20 | 1984-07-20 | Ultrahigh frequency switch |
JP150929/84 | 1984-07-20 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0169048A2 true EP0169048A2 (en) | 1986-01-22 |
EP0169048A3 EP0169048A3 (en) | 1986-08-27 |
EP0169048B1 EP0169048B1 (en) | 1991-09-25 |
Family
ID=15507492
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP85305047A Expired - Lifetime EP0169048B1 (en) | 1984-07-20 | 1985-07-15 | Ultra-high frequency switch |
Country Status (6)
Country | Link |
---|---|
US (1) | US4652840A (en) |
EP (1) | EP0169048B1 (en) |
JP (1) | JPS61112401A (en) |
AU (1) | AU572059B2 (en) |
CA (1) | CA1233206A (en) |
DE (1) | DE3584193D1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4780692A (en) * | 1987-05-04 | 1988-10-25 | Motorola, Inc. | Cableless switching element for waveguide having low loss and fast switching speed |
EP0361638A2 (en) * | 1988-09-28 | 1990-04-04 | Com Dev Ltd. | Microwave C-switches and S-switches |
FR2754108A1 (en) * | 1996-10-01 | 1998-04-03 | Alsthom Cge Alcatel | TRANSITION BETWEEN A CRETE WAVEGUIDE AND A PLANAR CIRCUIT |
US5995029A (en) * | 1996-11-06 | 1999-11-30 | Hyundai Electronics Industries Co., Ltd. | Parallel bit counter using bit sorters |
EP1557900A1 (en) * | 2004-01-22 | 2005-07-27 | Raafat R. Mansour | MEMS Based RF Components and a Method of Construction Thereof |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07120881B2 (en) * | 1987-07-31 | 1995-12-20 | 日本電気株式会社 | Waveguide switch |
US4782313A (en) * | 1988-01-12 | 1988-11-01 | General Electric Company | Transmission line shorting switch |
JPH0559791U (en) * | 1991-03-11 | 1993-08-06 | 敏彦 高倉 | Low frequency electromagnetic cooking device |
US5207318A (en) * | 1991-07-29 | 1993-05-04 | Dynatech Microwave Technology, Inc. | Plunger switch |
JPH0549728U (en) * | 1991-12-11 | 1993-06-29 | 川崎製鉄株式会社 | Conveyor belt cleaner |
US5604505A (en) * | 1996-02-26 | 1997-02-18 | Hughes Electronics | Phase tuning technique for a continuous transverse stub antenna array |
US5712603A (en) * | 1996-08-09 | 1998-01-27 | Kmw Usa, Inc. | Multipole multiposition microwave switch with a common redundancy |
AU4007799A (en) * | 1998-05-21 | 1999-12-06 | Relcomm Technologies, Inc. | Switching relay with magnetically resettable actuator mechanism |
US9059495B2 (en) * | 2012-06-05 | 2015-06-16 | Jorge A. Ruiz-Cruz | Compact multiport waveguide switches |
US10090128B2 (en) * | 2016-11-18 | 2018-10-02 | Rohde & Schwarz Gmbh & Co. Kg | Switch for switching between different high frequency signals |
Citations (6)
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US2627551A (en) * | 1948-12-15 | 1953-02-03 | Gen Electric | Ultrahigh-frequency transmission structure |
GB938503A (en) * | 1960-03-21 | 1963-10-02 | William Amos Etter | Electrical switching unit and switching systems incorporating such units |
DE2460266A1 (en) * | 1974-12-19 | 1976-07-01 | Rohde & Schwarz | Four-terminal network change-over device - changes network between two unbalanced inner conductors and all characteristic impedances are correctly matched |
US3969691A (en) * | 1975-06-11 | 1976-07-13 | The United States Of America As Represented By The Secretary Of The Navy | Millimeter waveguide to microstrip transition |
GB2078003A (en) * | 1980-06-09 | 1981-12-23 | Transco Prod Inc | Transfer switch |
EP0074613A1 (en) * | 1981-09-11 | 1983-03-23 | Nec Corporation | Ridge waveguide-to-microstrip line transition for high frequency amplifier |
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US3092771A (en) * | 1954-12-28 | 1963-06-04 | Sperry Rand Corp | Broadband transmit-receive device |
US2997675A (en) * | 1959-01-02 | 1961-08-22 | Gen Electric | Apparatus for electromagnetic wave guidance and control by electrical discharge plasmas |
US3036282A (en) * | 1960-01-18 | 1962-05-22 | Don Lan Electronics Inc | Co-axial switch |
US3086181A (en) * | 1960-05-06 | 1963-04-16 | Gen Electric | Coaxial line to waveguide transition |
US3182270A (en) * | 1962-11-02 | 1965-05-04 | Amphenol Borg Electronics Corp | Multiple position coaxial switch with angularly spaced radial channels |
US3278865A (en) * | 1963-05-31 | 1966-10-11 | Kane Engineering Lab | Device using multipactor discharge |
US3414849A (en) * | 1966-05-16 | 1968-12-03 | Microwave Ass | Radio frequency coaxial switches |
US3737812A (en) * | 1972-09-08 | 1973-06-05 | Us Navy | Broadband waveguide to coaxial line transition |
JPS544648B2 (en) * | 1972-11-10 | 1979-03-08 | ||
JPS5930322B2 (en) * | 1976-12-06 | 1984-07-26 | 日本電気株式会社 | Ultra-compact switch for waveguides |
JPS544648U (en) * | 1977-06-14 | 1979-01-12 | ||
JPS5787202A (en) * | 1980-11-19 | 1982-05-31 | Fujitsu Ltd | Strip line converter |
US4458222A (en) * | 1981-05-06 | 1984-07-03 | Microwave Semiconductor Corporation | Waveguide to microstrip coupler wherein microstrip carries D.C. biased component |
US4413243A (en) * | 1981-10-19 | 1983-11-01 | Motorola Inc. | Optimized transmission line switch |
-
1984
- 1984-07-20 JP JP59150929A patent/JPS61112401A/en active Granted
-
1985
- 1985-07-15 DE DE8585305047T patent/DE3584193D1/en not_active Expired - Fee Related
- 1985-07-15 US US06/755,127 patent/US4652840A/en not_active Expired - Lifetime
- 1985-07-15 EP EP85305047A patent/EP0169048B1/en not_active Expired - Lifetime
- 1985-07-16 AU AU45045/85A patent/AU572059B2/en not_active Ceased
- 1985-07-18 CA CA000486996A patent/CA1233206A/en not_active Expired
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2627551A (en) * | 1948-12-15 | 1953-02-03 | Gen Electric | Ultrahigh-frequency transmission structure |
GB938503A (en) * | 1960-03-21 | 1963-10-02 | William Amos Etter | Electrical switching unit and switching systems incorporating such units |
DE2460266A1 (en) * | 1974-12-19 | 1976-07-01 | Rohde & Schwarz | Four-terminal network change-over device - changes network between two unbalanced inner conductors and all characteristic impedances are correctly matched |
US3969691A (en) * | 1975-06-11 | 1976-07-13 | The United States Of America As Represented By The Secretary Of The Navy | Millimeter waveguide to microstrip transition |
GB2078003A (en) * | 1980-06-09 | 1981-12-23 | Transco Prod Inc | Transfer switch |
EP0074613A1 (en) * | 1981-09-11 | 1983-03-23 | Nec Corporation | Ridge waveguide-to-microstrip line transition for high frequency amplifier |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4780692A (en) * | 1987-05-04 | 1988-10-25 | Motorola, Inc. | Cableless switching element for waveguide having low loss and fast switching speed |
EP0361638A2 (en) * | 1988-09-28 | 1990-04-04 | Com Dev Ltd. | Microwave C-switches and S-switches |
EP0361638A3 (en) * | 1988-09-28 | 1991-10-02 | Com Dev Ltd. | Microwave c-switches and s-switches |
FR2754108A1 (en) * | 1996-10-01 | 1998-04-03 | Alsthom Cge Alcatel | TRANSITION BETWEEN A CRETE WAVEGUIDE AND A PLANAR CIRCUIT |
EP0834954A1 (en) * | 1996-10-01 | 1998-04-08 | Alcatel | Transition between a ridge wave guide and a planar circuit |
US5995029A (en) * | 1996-11-06 | 1999-11-30 | Hyundai Electronics Industries Co., Ltd. | Parallel bit counter using bit sorters |
EP1557900A1 (en) * | 2004-01-22 | 2005-07-27 | Raafat R. Mansour | MEMS Based RF Components and a Method of Construction Thereof |
Also Published As
Publication number | Publication date |
---|---|
JPH0237121B2 (en) | 1990-08-22 |
US4652840A (en) | 1987-03-24 |
JPS61112401A (en) | 1986-05-30 |
EP0169048A3 (en) | 1986-08-27 |
DE3584193D1 (en) | 1991-10-31 |
AU572059B2 (en) | 1988-04-28 |
CA1233206A (en) | 1988-02-23 |
AU4504585A (en) | 1986-01-23 |
EP0169048B1 (en) | 1991-09-25 |
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